FatigueandRecovery疲劳与恢复

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1、FatigueandRecoveryDefiningfatigueHowwouldyoudescribefatigue?“Areductioninmuscularperformanceorafailuretomaintainexpectedpoweroutput”MusculartirednessShortnessofbreathVarydependingonactivityCausesoffatigueInsufficientATPLacticacidGlycogendepletionFluidlo

2、ss-lowbloodpressureRecoveryProcessafterExerciseWhydoesa400msprintertakethesamedeepbreathsasamarathonrunneraftertherace,eventhoughtheyhaverundifferentdistances?Whydowetakedeepbreaths?RecoveryProcessisneededto….RebuildmuscularstoresofATPandPCthatwereusedd

3、uringexercise.Removelacticacid.ReplenishthemyoglobinO2stores(Myoglobinhasanimportant,ifsmallscale,roleincarryingO2fromhaemoglobintothemitochondriathusensuringtheprovisionofenergyinmuscles.Completerestorationisthoughttobecompletebythetimeneededtorecovert

4、healactaciddebtcomponent.ReplaceGlycogen.Therearemanyotherprocessesinvolvedinrecovery.Processessuchasrestorationofcardiac/pulmonaryfunctioningtorestingvalues,returntonormalbodytemperatureetc.allrequireadditionalO2(althoughsubstantiallylessthanthatuseddu

5、ringthealactacidandlactacidcomponents)andthereforeaddstimetopayingbacktheO2deficittoreachthepreexerciselevel.TheoxygendebtOxygenDebt=“theamountofoxygenconsumedduringrecoveryabovethatwhichnormallywouldhavebeenconsumedatrestinthesameperiodoftime”ExcessPos

6、t-exerciseoxygenconsumption(EPOC)=TheneedforO2torapidlyreplaceATPandremovelacticacid.OxygendebtwilloccurifanaerobicactivityhasoccurredDebtcanbemeasuredbyanalysingoxygenconsumptionbeforeandafterexercise.Oxygendebtusedtocompensateforoxygendeficit…..Oxygen

7、DeficitOxygendeficitisthedifferencebetweentheO2requiredduringtheexerciseandtheO2actuallyconsumedduringtheactivityO2isnotavailableforthefirstfewminsapproximately,soanoxygendeficitwillalwaysoccur.Oxygendebthas2components:1=AlactacidDebt“Itisthevolumeofox

8、ygenrequiredtorestorephosphogensusedinthealacticorATP-PCenergysystem.”fastreplenishment1stcomponentofoxygendebttobereplaced2-3minstoreplenishphosphocreatine2-3litresof02consumedtoprovideenergyIntensework-thisrecoveryprocesscanocc